The Best and Worst Burgers

Best burger with mushrooms and cheese

A burger topped with mushrooms has to be healthier than the competition, right?

"When it comes to fast food, all bets are off," says Brooking. "Mushrooms could have been sautéed in butter or high-fat oil, or had a lot of salt added."

Dairy Queen's quarter-pound Mushroom Swiss GrillBurger is best, with 590 calories, 35 grams of fat (12 grams saturated), and 700 milligrams of sodium. Remember: Veggies are usually a smart idea, but check nutritional information to see how much fat those seemingly healthy toppings are adding.